In C# we have ref and out, while in Java we don‘t.
To do something similar to ref, there are normally 4 ways.
Check this out: http://stackoverflow.com/questions/5614562/how-to-do-the-equivalent-of-pass-by-reference-for-primitives-in-java
Choice 1: make a public member variable in a class
Choice 2: return the value instead of pass by reference
Choice 3: make it a class or static variable
Choice 4: Create a single element array of type int and pass that
how to implement C# ref in Java
原文：http://www.cnblogs.com/neweracoding/p/4198059.html